Allen's Green is a village in Hertfordshire, England.
It is situated within the CM21 postcode district, which is within the Sawbridgeworth post town.
CM21 is the only postcode district within the Sawbridgeworth post town.
The Sawbridgeworth post town is within the Chelmsford postcode area.
Administrative Ward: Much Hadham
Administrative District: East Hertfordshire
Administrative County: Hertfordshire
Country: England
UK Parliament: Hertford and Stortford
NHS Local Health Authority: East of England
NHS Region: North, Midlands and the East